books.google.com - *Searchable CD ROM containing the entire book (including images) *Over 450 color images, plus never before published images provided by the George Eastman House collection, as well as images from Ansel Adams, Howard Schatz, and Jerry Uelsmann to name just a few The role and value of the picture cannot...http://books.google.com/books/about/The_Focal_Encyclopedia_of_Photography.html?id=NMJxyAwGvKcC&q=photogenic+drawing+compare+daguerreotype&utm_source=gb-gplus-shareThe Focal Encyclopedia of Photography